4363 119 Mechatronics | Capacitor | Control Theory

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TE Mechanical Pune University Question Papers for May-2013 Exam!
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  Page 1 of  4   [Total No. of Questions: 12 ] [Total No. of Printed Pages: 4 ]   UNIVERSITY OF PUNE[4363]-119   T. E. (  Mechanical  ) Semester-IIExamination  –  2013    Mechatronics (2008 Course) [Time: 3 Hours] [Max. Marks: 100] Instructio ns:  1  Answer any three questions from each section.  2  Answers to the two sections   should be written in separate answer-books  .  3  Neat diagrams must be drawn wherever necessary.  4  Assume suitable data, if necessary.  5 Use of Scientific calculator is allowed.   SECTION  –  I Q.1 A Explain in brief Sensitivity, Accuracy and Precision with suitableexample for each.10BAn RTD  0 =0.0037 at    0 =50 °  ;  50 °  =350 ℎ . find  (75 °  )  6 OR  Q.2 A Explain with a neat sketch the load cells along with its applications. 6B A strain gauge and bridge circuit are used to measure the tension forcein a steel bar. The steel bar has a cross sectional area of 50mm 2 . Thestrain gauge has a nominal resistance of 120 Ω and GF of 2. The bridgeis supplied with 10V. when the bar is unloaded, the bridge is balancedso the output is 0 V. then force is applied to the bar, and the bridgevoltage goes to 0.0005 V. find the forc e on the bar.(Young’s Modulus of steel is 2.1 ×10 5 N/mm 2 , assume Poisson’s ratio=0.3)  10Q. 3 A Calculate the capacitance of an air gap parallel plate capacitor with plates (25mm × 25mm) & a plate separation of 1mm. Calculate thechange in capacitance when movable plate is displaced 0.4 mm farther from fixed plate. (Given: ∈ 0 = 8.854 × 10 -12 )8B Explain in brief the DC motor as an electro mechanical system. 10 OR  Q. 4 AAn LVDT with a secondary voltage of 5 V has a range of  ± 1 inch.Find(i)   Linear Range(ii)   The output voltage when the core is -0.75 inch from thecentre.(iii)   Calculate the core movement from the centre when outputvoltage is +3V DC.10B Explain capacitive and inductive principles used in position sensing. 8  Page 2 of  4   Q. 5 A Derive the model equation of a rotational mechanical system withtorsional stiffness, damping and mass moment of inertia6B Use block diagram reduction to simplify the block diagram shown infigure Q 5 (b) below into a single block relating Y(s) to R(s)10 OR  Q. 6 A Explain in brief ADC and DAC 8B Use block diagram algebra to reduce the block diagram shown if fig Q6 (b)8 SECTION II Q. 7 A Explain open loop and closed loop control system with suitableexample each showing input and output8B Construct the block diagram for resistance, capacitance and inductancearranged in series with voltage E applied across them. Commentwhether it is open loop or closed loop.8 OR  Q. 8 A Explain the terms process load and process equation. 8B A controller outputs 0 to 5 V DC to control the heater from 10 W to 100W with linear dependence. Calculatei)   The voltage corresponding to 55 W8 R (s)  Page 3 of  4   ii)   This value of voltage expressed as % of controller outputQ. 9 A Define proportional plus Derivative (PD) controller along withmathematical equation. Explain the reason why derivative controller isadded to proportional.6B Figure Q 9 (b) shows an error time graph. Sketch the PD controller output w.r.t time Kp = 5%/%, KD = 0.5 %/s and m(0) = 30%10 OR  Q. 10 A Define Proportional Band, Integral action time derivative action time. 8B Explain the term Offset error in proportional control. Which mode of controller is used to minimize the offset error and why?8Q. 11 A Explain the difference in Timers and Counters used in PLC programming with a suitable example each.6B Consider a washing machine with in-flow valve (Q1), drain-flow valve(Q2), switch for door used to input cloths (I3), load switch to sensecloths in machine (I4), and washing motor (Q3). Develop a plc ladder  program for following objectives.i)   The cycle is ON when START (push-to-ON) (I1) button is pushed and will continue ON till STOP (push-to-OFF) (I2) button is pushed.ii)   The cycle shall be stopped as where it is when door is opened(Door switch is OFF)iii)   When door is closed (Door switch is on) and cloths are fed(Load switch is ON) in-flow is started for 1 minute.iv)   When in-flow is stopped, and door is closed washing motor isON and will continue to be on for 5 minutes.v)   When washing motor is stopped, drain-flow opens andcontinues to be open for 3 minutesMention the input and outputs and which input is connected towhich PLC input terminal12  Page 4 of  4   Write the Boolean equation of each rung.Draw ladder diagram with Ex ON, Ex OFF and PLC output symbol(Do not show switches in the ladder program) OR  Q. 12 A Explain advantages of PLC ladder program over ladder program 6B Consider a tank with inflow valve V1 and outflow valve V2 connectedto a tank at top and bottom respectively. The level high (LH) and levellow (LL) floats switches mounted at top and bottom to indicate thelevel. Develop a PLC ladder program for the following objectivesi)   When LL is OFF and LH is OFF, the V1 should be ONii)   V1 shall continue to be ON till LH is ONiii)   When LL and LH is ON, V1 should be OFF and V2 should beONiv)   V2 should continue to be ON till LL is OFF.Mention the input and outputs and which input is connected to whichPLC input terminalWrite the Boolean equation of each rung.Draw ladder diagram with Ex ON, Ex OFF and PLC output symbols(Do not show switches in ladder program)12
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